12/17 Physics Recording - Free Body Diagrams

Part 1  https://youtu.be/mtshfbSRLqk

Part 2 https://youtu.be/Xkjmhkc8maw

12/17 Physics class and homework due 1/6

Hi folks,

First off, happy holidays everyone!!!!  I hope all your events are wonderful, warm and safe.

In class today, we got into a new concept of free body diagrams. Free body diagrams help to analyze the different forces on objects in order to determine the net force and acceleration of those objects.

I'm taking us a little deeper than the book goes on this subject so homework this week is to read the following web pages

http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Drawing-Free-Body-Diagrams

http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Determining-the-Net-Force

I would highly recommend taking a look at the problems and the solutions on each one of these pages.

Also, do the interactives on this page http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Free-Body-Diagrams/Free-Body-Diagram-Interactive. The page is a little clumsy, but with a bit of patience hopefully you'll get the hang of it. When you get the answer, write down the force body diagram on a separate piece of paper to hand in.

See you all in 2019!!!

Jim Mueller

(919) 907-3217

Outside a bit for Physics today

Hi folks,

If we have time, I'd like to spend a little of it outside today so please dress ready to be outside for about 20 minutes or so.

See you soon!

Best,

Jim Mueller

(919) 907-3217

Physics Class is Cancelled for tomorrow

Hi folks,

I hate to say this but with today's snow and the prediction of freezing rain tomorrow I think it's best if we cancel class.  

Stay safe and warm everyone!

Best,

Jim Mueller

(919) 907-3217

12/3 Physics Class Newton's Second Law

Part 1  https://youtu.be/iHdYONfvjQc

Part 2 https://youtu.be/AIanmTN3WBY

12/3 Physics Class and homework due 12/10

Hi folks,

We spent some more time getting to know Newton's Second Law today. To "get our hands on" the concept we went outside and saw how Newton's second law applied to pulling a wagon. We put more and more mass into the wagon (0, 1 and 2 students) and saw that as we increased the mass the acceleration went down.

Homework due next week is:

Read pages 59 - 70 in the text book



Do Review Questions 1 - 18 on page 71 and 72

Do Plug and Chug questions 1 - 5 on page 72

Physics Class

Hi folks,

We are going to be doing some stuff outside for physics class so please dress appropriately. 

Best,

Jim Mueller

(919) 907-3217

11/26 Physics Recording - Newton's first and second laws

https://youtu.be/VAPZMosDmdg

11/26 Physics update and homework due 12/3

Hi folks,

We have began our unit on Newton's three laws of motion.  Today we covered Newton's first law and introduced Newton's second.  We will be doing more with Newton's second in upcoming weeks.  

For homework this week,

Read pages 43 - 55 in the text book.

Do Think and Explain questions # 1 - 12  on page 57

   

Best,

Jim Mueller

(919) 907-3217

11/14 Physics Recording - Vector math

https://youtu.be/KWYhga99Bmo

11/12 Physics update and homework due 11/29

Hi folks,

First off, NO CLASS next Monday due to the Thanksgiving break.  Enjoy that turkey and stuffing!!!

Today we did a bit of work on the concepts of vectors and how to add them together to find final velocities.  We also did a fairly mathematically complex lab were the students had to predict the speed  a Hot Wheels car needed to cover a certain distance and the height that car needed to be dropped from to reach that speed.  The lab required some very tricky work with the formulas we've been working with the past few weeks.

For homework this week, 

Read pages 28 - 32 in the Conceptual Physics text book.

Do the exercise on page 32.

Do plug and chug questions # 1 - 5 on page 41

Do think and explain questions 1 - 2 on page 41

Do Think and Solve questions 1 - 6 on page 42.

Answers below.

Extra Credit Possibility!!!!!!

For extra credit, use these videos to calculate the vertical velocity, horizontal velocity, resultant velocity and find the acceleration that the car had to have by the time it left the ramp. The car travels 332 ft.  Please show ALL #'s and calculations so that I can check your math.

https://www.youtube.com/watch?v=7SjX7A_FR6g

https://www.youtube.com/watch?v=RYLo2qFYQ7s

Plug and Chug

1. 250 km/h 150 km/h

2. 175 km/h

3. 141.4 km/h

4. 70.71 

5. 5

Think and Explain

1. 9  1

2. You move faster, take a look at the vectors.  :)

Think and Solve

1.  a.  10

    b. 10 NW

2.  200

3. 5 m/s

4 1.25m

5. 30 m/s

6. 250m  Don't get fooled by the wording on this.  It's just a typical type of these problems.  Find out how long it's going to take to hit the ground and then find out how far it travels in that time.  

Recording of 11/5 Physics Class - Projectile Motion

https://youtu.be/mIWPI8C4gyE

10/5 Physics class and homework due 10/12

Hi folks,

This week we took our new found understanding of 2 dimensional motion and put it to the test by finding out the horizontal, vertical and resultant velocities of a dart shot out of a Nerf gun.

From looking over the quizzes it looks like quite a few folks could use the opportunity to study up on these math concepts.  For homework this week, I'd like you to retake today's quiz.  I've included the answers so that you can make sure you get them right and more importantly really understand how to do these problems.  I highly recommend doing the quiz, checking the answers and redoing from scratch all answers that you don't get right.  Then, next Sunday, before class, take the quiz again and make sure you really understand how to do the material.  Feel free to watch the recordings if you're not sure how to do these.  That's why they are there.

Good luck!

Best,

Jim Mueller

(919) 907-3217

Some outside work for physics

Hi folks,

Today's plan is to spend a bit of time outside for physics so please be sure to have some outside clothes.

See you all soon.

Best,

Jim Mueller

(919) 907-3217

Video to help with homework

Hi folks,

I was helping a student with some of the homework for this week and I recorded some of it just in case some other folks would like some help as well.

Here you go.  https://youtu.be/QEuJrS_1haY

Best,

Jim Mueller

(919) 907-3217

Physics Class

Hi folks,

We are going to spend some time outside tomorrow weather permitting so be sure to dress accordingly.   See you all soon!

Best,

Jim Mueller

(919) 907-3217

Extra Recording

Hi folks,

The second recording I sent was for my Earth Science class.  It defaulted to the wrong email address.  Sorry about that.  However, if you want a atomic structure refresher…please enjoy!  :)

Best,

Jim Mueller

(919) 907-3217

Recording of 10/29 Physics Class - 2 Dimensional Motion

https://youtu.be/hELtSoUqfkk

10/29 Physics Class and homework due 11/5

Hi folks,

Today we spent time going over some of our previous problems and trying to make sure everyone is on the right track.

For homework, I want you to predict how far an object would go (d horizontal )  if it's shot parallel to the ground at the following heights and speeds.  Feel free to review your notes on this before you start.  Use d = 1/2 at^2 to find time.   Then use that time to find distance by using v=d/t.  (Use v=d/t to find horizontal distance travelled since there is NO acceleration horizontally.)

1.  5 m high  5 m/s

2.  10 m high  5 m/s

3.  15 m high 5m/s

4.  10 m high 10 m/s

5.  15 m high 30 m/s

Now, once you've done those calculations go to this website. https://phet.colorado.edu/en/simulation/projectile-motion.  When you get there click on the play triangle and then click "Intro".

Now use the website to see if your calculations are correct.  Set the appropriate velocities and heights and see if your calculations match the simulation. You can adjust the height by clicking and dragging on the tower the cannon is sitting on.  Be sure the cannon is shot at 0 degrees.  You can move the "target" to see the distance it traveled.  You can also use the measuring tape and/or the blue box that are located at the top middle of the screen.  Your calculations should be close to the results.  If not…check your math.

6.  Did your calculation match the sim?

7.  Put the initial speed to 0m/s.  Do the times still match the times you calculated for the different heights?  (Hint: they should.)

Under "Velocity Vectors" to the right, click on  "components" .

Shoot the cannon parallel to the ground (0 degrees).  You may want to put this on slow and feel free to pause the sim as the cannon ball is moving.

6.  As the pumpkin flies through the air, describe how the vertical velocity vector changes?

7.  As the pumpkin flies through the air, describe how the horizontal vector changes?

Now, turn on the "total" in the velocity vector box.  Pause the simulation as the pumpkin flies.  Notice carefully how the resultant velocity is a combination of the vertical and horizontal velocities.

Now shoot the cannon upwards at an angle of 60 degrees.

8.  As the pumpkin flies through the air, describe how the vertical velocity vector changes?

9.  As the pumpkin flies through the air, describe how the horizontal vector changes?

Typo/error in the answers for the 10/29 Homework assignment

In question #3c I should have used 7 seconds instead of 6. So the answer should be:

v=d/t
v= 76/7
v= 10.9 m/s

Sorry about that folks.

Jim Mueller

10/22 Class recording and recording of the Ball Throwing Math

https://youtu.be/DhjBtjUYu3Q  Class Recording

https://youtu.be/g5b1kYxZv0g  Math of the Ball Throw

10/22 HS Physics update and homework due 10/29

Hi folks,

This week we covered gravity in a bit more detail and spent some time exploring gravity in relation to our acceleration and velocity formulas we've been working on.  To do this, we went outside and everyone got a chance to throw a ball as far and as high as they could.  We then calculated the height, the vertical velocity and the horizontal velocity of the throw.

For homework this week:

Read pages 168 - 179 in the Conceptual Physics book.

Do Review Questions 1 - 14 on page 180.

Also, calculate the answers to the following questions using the formulas we used today.  Also, we are in Newtonia so don't worry about air resistance.  :) 

1.  Using the first dive on this video https://youtu.be/ttetLjQ4du8?t=81

a.  If the platform is 30 m high, how long does it take him to hit the water?

b.  How fast is he going when he hits the water?  (Use the time you found from the first question)

2. Use the first drop from this video https://youtu.be/-6h65t2MOfU?t=286

a.  If the dam is 165 m high, how long does it take the ball to hit the ground?

b. How fast is the ball falling when it hits the ground?

3.  Use the first hit on this video video https://youtu.be/rojPcO_LwvM?t=49  The ball is in the air for 7 seconds.

a.  How high is this ball hit?  (Remember to 1/2 your time.  It goes up for half the time and comes down for half)

b.  What was the vertical speed of the hit?

c.  If that ball flew 76 m (about 250 ft) what was the horizontal speed of the ball?

4. Use the first throw on this video https://youtu.be/n5ctPAqt_wk?t=14  Assume the ball was in the air for 3 seconds.

a. How high does this ball go?

b. How fast is the vertical speed?

c. How fast is the horizontal speed if the throw was 70 m (about 230 ft)

5.  Use the first punt on this video https://www.youtube.com/watch?v=OtP1eRKW9PI  The ball is in the air for 6 seconds.

a.  a. How high does this ball go?

b. How fast is the vertical speed?

c. How fast is the horizontal speed if the punt was 82 m (about 91 yards)

Answers:

1.

a.)  d = 1/2at^2  

 30 = 1/2 10 t^2

 30 = 5 t^2

 6 = t^2

 2.5s = t

b). v= at

v = 10 x 2.5

v = 25 m/s about 56 mph!!!

2. 

a) d = 1/2at^2  

165m = 1/2 10 t^2

165 = 5 t^2

33 = t^2

5.7 s = t

b) v = at

 v = 10 x 5.7

 v = 57 m/s about 128 mph!!!!!

 3. Remember to half the time for the calculations since half the time was going up and the other half down.

a.)  d = 1/2 at^2

   d = 1/2 10 x 3.5^2

   d = 5 x 12.3

   d = 61.5 m about 202 ft

b ) v = at

     v = 10 x 3.5

     v = 35 m/s  or 115 mph

c) v = d/t

   v = 76 / 6   Use the full 6 seconds here because it did take the ball 6 seconds to travel that 76 m.

   v = 12.7 m/s  about 28 mph

 

4.  Remember to half the time for the calculations since half the time was going up and the other half down.

a) d = 1/2 at^2

    d = 1/2 10 x 1.5^2

   d = 5 x 2.25

   d = 11.25 m about 37 ft

b) v = at

   v = 10 x 1.5

   v = 15 m/s about 33 mph

c) v = d/t

    v = 70/3   Use the full time here.

   v = 23.3 m/s about 52 mph !!

5. Remember to half the time for the calculations since half the time was going up and the other half down.

a. d = 1/2 gt^2    

d = 1/2 x 10 x 3^2   

d = 5 x 9

d = 45 m  about 144 ft

b. v = at

v = 10 x 3

v = 30 m/s  about 67 mph!

c. v = d/t

v = 82 / 6  Use the full time here.

v = 13. 7 m/s  about 31 mph

10/15 Physics update and homework due 10/22

Hi folks,

Today we spent a good amount of time tackling those velocity and acceleration problems from even more angles.

For homework this week I'd like you to take a look at the following websites and have some fun with the interactives. 

For this link, get at least 8 stars.  These take some time to get used to but with some trial and error you should be able to get the hang of them.  I found the Speed v. Time Graphs to be a bit easier than the Distance vs. Time ones. When you are done take a picture or a screen shot to show me that you've done the assignment.   Graphs and Ramps Interactive

For this link, do all the "Apprentice Level" and all the "Master Level" problems.  Again, take a screen shot or a picture when you're done.  That Motion Concept Builder

Have fun!

10/15 HS Physics - Working more problems

https://youtu.be/igp7wbndZuY

10/8 Physics Recording - Acceleration Graphs

https://youtu.be/Fhf4R5CfgBk

10/8 Physics Class update and homework due 10/15

Hi folks,

Got into some of the serious nitty gritty of velocity, distance and acceleration graphs today.

For homework this week:

On page 26 do all the Plug and Chug questions. I've included the answers in a photo below.

On page 27 do all the Think and Explain questions

Also do questions 1 - 5 in the enclosed document.

Best,

Jim Mueller

(919) 907-3217

10/1 Physics Recording - Acceleration

https://youtu.be/WpgYOJnHYK0

10/1 Physics class update and homework due 10/8

Hi folks,

Today we spent some time getting to know the concept of acceleration. It's a key concept in physics and one we will be working with quite a bit and coming back to a lot over the year.  Most of today was spent on a lab working with the acceleration of rubber band powered vehicles.

Homework for this week will be to work with the data we collected in class to create some graphs and to use those graphs to answer some questions.

To help with this, please watch this video.  It's me explaining how to calculate the data for the graph.

First off, using only your group's data, create two different graphs. (Please use graph paper.)  One for velocity vs. time and one for acceleration vs. time.  Time should always be on the horizontal axis.  

Once you finish your graphs, answer the following questions.

1.  What was the greatest acceleration that you saw overall?


2.  What was the smallest acceleration?


3.  When you saw a negative acceleration, what did that mean the car was doing?


4.  What was the highest speed any of the cars achieved?


5.  If a car has a constant positive acceleration, what is the car continuing to do?


6.  If a car has no acceleration what is the car continuing to do? 


7. Draw 2 more graphs (one for velocity and one for acceleration) but this time, try to image what the graphs would have looked like in a perfect world.  In other words, if the cars had a nice steady acceleration at the beginning and at the end of their runs.  Think carefully about this.  The acceleration graph may be different than you first think.  

Best,

Jim Mueller

(919) 907-3217

9/24 Physics update and homework due 10/1

Hi folks,

Today we spent time diving into the concepts of motion, speed and velocity.  We also did a lab where the students had to find the speed of a dart shot out of a Nerf gun.  For homework this week, please do all the questions on the enclosed .pdf.  I've included a second .pdf with the answers so be sure to check your answers.  There will be a quiz on this material next week so be sure you feel comfortable with these problems.

Good luck,

Jim Mueller

(919) 9073217

Recording of 9/17 Physics class - Motion is relative

https://youtu.be/PDbNAQMpzFQ

9/17 Physics update and homework due 9/24

Hi folks,

First off, I think I am still missing some emails for some of the students.  For some reason my email program failed to save any of the emails I entered last week.  Parents, please check and see if your child is missing from the list.  If so, I'd appreciate it if you could give me their address.  Thank you!

Today we began our study on linear motion. We took a look at how all motion is relative and we introduced some vocabulary for motion, speed, distance, displacement, velocity and acceleration. 

Read 10 - 16 and 21-23 in your Conceptual Physics text

Do Review Questions on pg 25 #'s 1- 14

For Extra Credit do any one of the 3 activities on pg. 26

Re: Re-Check about Physics Class today

We're coming :)

On Mon, Sep 17, 2018 at 9:01 AM Gabriele H. <twocblog@gmail.com> wrote:

We are planning to attend ☺️ 

Thanks!

Gabby

On Mon, Sep 17, 2018 at 8:51 AM Lisa Johnson <lisa@brightlinks.us> wrote:

We are planning to come to class. 

On Mon, Sep 17, 2018, 8:33 AM Ali Rosselle <ali_rich@bellsouth.net> wrote:

No issues or concerns here! We can certainly make it. 😊

Thanks!
Ali
Sent from my iPhone

> On Sep 17, 2018, at 8:27 AM, Jim Mueller <jim@bitesizephysics.com> wrote:
>
> Hi folks,
>
> Well, it looks like Florence may still be causing trouble.  From the weather websites we should be done with major precipitation this morning.  More to come this afternoon.  However, I'm hearing reports of flooded roads and power outages.
>
> How do folks feel?  I'm certainly willing to make the drive down.  Please let me know if you aren't planning to come.  If too few folks are going to be there we'll let class go for this morning.
>
> Thanks everyone.
>
> Jim Mueller
> (919) 907 3217

Re: Re-Check about Physics Class today

We are planning to attend ☺️ 

Thanks!

Gabby

On Mon, Sep 17, 2018 at 8:51 AM Lisa Johnson <lisa@brightlinks.us> wrote:

We are planning to come to class. 

On Mon, Sep 17, 2018, 8:33 AM Ali Rosselle <ali_rich@bellsouth.net> wrote:

No issues or concerns here! We can certainly make it. 😊

Thanks!
Ali
Sent from my iPhone

> On Sep 17, 2018, at 8:27 AM, Jim Mueller <jim@bitesizephysics.com> wrote:
>
> Hi folks,
>
> Well, it looks like Florence may still be causing trouble.  From the weather websites we should be done with major precipitation this morning.  More to come this afternoon.  However, I'm hearing reports of flooded roads and power outages.
>
> How do folks feel?  I'm certainly willing to make the drive down.  Please let me know if you aren't planning to come.  If too few folks are going to be there we'll let class go for this morning.
>
> Thanks everyone.
>
> Jim Mueller
> (919) 907 3217

Class is ON

OK folks. Looks like enough folks are ready to venture out.

See y'all around 10! Be safe.

Jim Mueller

Re: Re-Check about Physics Class today

We are planning to come to class. 

On Mon, Sep 17, 2018, 8:33 AM Ali Rosselle <ali_rich@bellsouth.net> wrote:

No issues or concerns here! We can certainly make it. 😊

Thanks!
Ali
Sent from my iPhone

> On Sep 17, 2018, at 8:27 AM, Jim Mueller <jim@bitesizephysics.com> wrote:
>
> Hi folks,
>
> Well, it looks like Florence may still be causing trouble.  From the weather websites we should be done with major precipitation this morning.  More to come this afternoon.  However, I'm hearing reports of flooded roads and power outages.
>
> How do folks feel?  I'm certainly willing to make the drive down.  Please let me know if you aren't planning to come.  If too few folks are going to be there we'll let class go for this morning.
>
> Thanks everyone.
>
> Jim Mueller
> (919) 907 3217

Re: Re-Check about Physics Class today

No issues or concerns here! We can certainly make it. 😊

Thanks!
Ali
Sent from my iPhone

> On Sep 17, 2018, at 8:27 AM, Jim Mueller <jim@bitesizephysics.com> wrote:
>
> Hi folks,
>
> Well, it looks like Florence may still be causing trouble. From the weather websites we should be done with major precipitation this morning. More to come this afternoon. However, I'm hearing reports of flooded roads and power outages.
>
> How do folks feel? I'm certainly willing to make the drive down. Please let me know if you aren't planning to come. If too few folks are going to be there we'll let class go for this morning.
>
> Thanks everyone.
>
> Jim Mueller
> (919) 907 3217

Re: Re-Check about Physics Class today

Thought we were making it - just lost power with a spectacular pop of the transformer.  However, we are good to come to physics.

At least one lane is closed on 64 east bound at 55 due to flooding so people should be aware of that. (Reported an hour ago)

Linda

On Mon, Sep 17, 2018 at 8:27 AM Jim Mueller <jim@bitesizephysics.com> wrote:

Hi folks,

Well, it looks like Florence may still be causing trouble.  From the weather websites we should be done with major precipitation this morning.  More to come this afternoon.  However, I'm hearing reports of flooded roads and power outages.

How do folks feel?  I'm certainly willing to make the drive down.  Please let me know if you aren't planning to come.  If too few folks are going to be there we'll let class go for this morning.

Thanks everyone.

Jim Mueller
(919) 907 3217

--

From the journey...

Re-Check about Physics Class today

Hi folks,

Well, it looks like Florence may still be causing trouble. From the weather websites we should be done with major precipitation this morning. More to come this afternoon. However, I'm hearing reports of flooded roads and power outages.

How do folks feel? I'm certainly willing to make the drive down. Please let me know if you aren't planning to come. If too few folks are going to be there we'll let class go for this morning.

Thanks everyone.

Jim Mueller
(919) 907 3217

Physics Class is ON for Monday

Hi folks,

From what I'm hearing, it sounds like the roads should be passable for class tomorrow. Please let me know if, for some reason, you can't make it and please be safe. I record all my classes so if you can't be there you can always watch the recording.

I hope everyone was nice, safe and comfortable through these past few days.

Best,
Jim Mueller
(919) 907 3217

Science Jim classes next week

Hi folks,

Well, we're heading into the unknown here and with that in mind I figured I'd put a little plan together regarding classes for next week.  

My plan is to email folks to let them know if class is a go or not.  However, my big worry at the moment for my location is loss of power/internet.  So, if you don't hear from me, assume class is OFF.  

Please don't hesitate to contact me to let me know if you won't be able to make it to class for any reason.  If most folks can't make it to class we may cancel class due to lack of attendance.  

My phone # is (919) 907-3217 if you wish to text or call for information about class.  Assuming my phone is still operational and has power I will get back to you ASAP.

Here's hoping this email is for not and all will be well for all of us next week!

My best wishes for safety and comfort for everyone next week!

Jim Mueller

Recording of 9/10 Physics Class

https://youtu.be/LxSxsQmSmf8

9/10 Physics Class - Intro to Class

Hi folks,

Each day after class, I will be sending and email with a short description of what we did in class as well as the homework that is due next week.

This week we spent some time going over class expectations and the grading procedures. We also spent a bit of time discussing why science is necessary and how it is done.

Homework for next week is:

Read pages 1 - 7 In the Conceptual Physics text
Do Review Questions 1 - 10 on page 8
Do Think and Explain questions 1 - 3 on page 8

By the way, my email address list failed me so, parents, if you wouldn't mind, could you please pass on this information to your children. Thank you!

Best,
Jim Mueller